My half doors were so seized up that heat and PB Blaster wouldn't work on 3 of them. I had to drill them out, eventually ruining one of the T-shaped backing plates on the inside of the door. No one sells that plate that I could find. I had to get a thick, flat piece of metal from a junk yard and fab it myself. To get to that plate I had to cut a big hole in the inside of the door, and then have someone weld that back on.
1991 YJ, rebuilt 4.0L in spring 2009 at 234,000 miles, no lift yet, slightly offset wheels, 235/75/15 tires for now, rag top, sold the hard top. Over 35,000 miles on the rebuild and counting.
2006 Jeep Liberty. Nothing special, all stock.